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Most interviews for ecommerce developers focus on the wrong stuff. Years of experience, a quick glance at a portfolio, done. But here's the thing - two developers can have almost identical resumes and still build completely different stores. One loads in under two seconds and shrugs off a flash sale. The other falls over the second traffic spikes past a few hundred visitors. That gap almost never comes down to experience on paper. It's about the actual technologies they know, not just the platform names sitting on their LinkedIn.
Below is a walk-through of the technical stuff genuinely worth checking before you commit to anyone - and why each piece actually matters once your store's live.
A resume tells you what someone's touched. It doesn't tell you how well they understood any of it. Plenty of developers list "a year on Shopify" without ever once building a custom app, wiring up an API, or fixing a real performance problem under pressure. That gap between surface-level familiarity and actual depth? That's exactly where stores run into trouble down the road.
Checking specific technologies upfront - not just platform names on a resume - is really the only way to spot that difference before you're locked into a contract.
The platform is the foundation everything else sits on, so this is worth nailing down first. A developer who's genuinely strong on one platform tends to catch problems that someone with surface-level knowledge would just walk right past. Ask about actual customizations they've shipped, not just which platform logos they list.
Shopify & Shopify Plus – Liquid templating, custom app development, and Shopify's API ecosystem
Magento (Adobe Commerce) – PHP-based architecture, module development, and Magento's notoriously tricky caching and indexing systems
WooCommerce – WordPress hooks, filters, and plugin-level customization
BigCommerce – Stencil framework knowledge and API-based headless setups
Shopware, PrestaShop, OpenCart – less common, sure, but relevant if your supply chain or region calls for it
Frontend is what shoppers actually see and click on, so weak skills here show up fast - bounce rates, abandoned carts, the works. Someone who only knows how to drag boxes around in a theme editor is not the same as someone who can actually write performant frontend code from scratch. That distinction matters way more than people give it credit for.
HTML, CSS, and JavaScript fundamentals – still the backbone of every storefront, no matter the platform
React or Vue.js – increasingly common for headless commerce builds and custom storefronts
Responsive design implementation – not just "looks fine on my phone," but actually tested across real device sizes
Core Web Vitals optimization – load speed, interactivity, visual stability - all of it feeds directly into conversions and search rankings
Backend is where weaker developers usually get exposed, mostly because it's less visible and harder to fake convincingly. This layer handles inventory logic, order processing, all the stuff that quietly breaks and costs you money when it's built badly. Worth asking pointed questions here about the actual languages and frameworks they've used in production, not just theory.
PHP – still core to Magento and WooCommerce development
Node.js – common in headless and API-driven architectures
Database management – MySQL, PostgreSQL, or whatever's platform-specific
Server architecture knowledge – caching, load balancing, scaling for traffic spikes
Basically no modern store runs in isolation anymore. Inventory systems, shipping providers, CRMs, accounting software — all of it needs to talk to your storefront somehow, and that's usually where the real custom development work happens. A developer without solid API chops will struggle here no matter how good their frontend work looks.
REST and GraphQL APIs – for connecting to ERP, CRM, and inventory management systems
Webhook implementation – real-time syncing between your store and other tools
Third-party logistics integrations – shipping calculators, fulfillment platforms, tracking systems
Marketing tool integrations – email platforms, analytics tools, ad pixel setups
Payment handling isn't the place for "good enough." Mistakes here can mean lost transactions, or worse, actual compliance violations. A developer needs to know more than how to plug in a payment gateway — they need to understand how to do it in a way that actually protects customer data. Honestly, this is one area worth being genuinely picky about during vetting.
PCI DSS compliance basics – even if a specialist handles the deep audit, your developer should understand the requirements
Multiple gateway integrations – Stripe, PayPal, Authorize.net, and platform-native options
SSL and data encryption practices – non-negotiable for anyone touching payment information
Fraud prevention tools – experience flagging suspicious transactions before they turn into chargebacks
A store that works fine in testing can still fall apart the moment real traffic hits it, which is why performance tooling matters just as much as the build itself. This part often gets skipped in a rushed hiring process, and honestly, it's usually the part that causes the most damage later. Ask specifically how someone's handled scaling on past projects — real numbers, not vague reassurance.
CDN implementation – Cloudflare, Fastly, or platform-native content delivery
Caching strategies – server-side and browser-level caching to keep pages fast under load
Cloud hosting familiarity – AWS, Google Cloud, or platform-specific hosting environments
Load testing experience – knowing how a build holds up before a real sale event, not after
This is the least exciting part of the conversation, but it tells you a lot about how someone actually works. Developers who skip version control or push straight to a live store cause avoidable outages - it happens more than you'd think. Small thing to check, big signal about professionalism.
Git or similar version control systems – tracking changes, rolling back safely when something breaks
Staging environment usage – testing changes before they go live, not on the production store
Automated testing practices – at least some basic QA before deployment
Documentation habits – clear notes on custom code so future changes don't turn into guesswork
Listing skills on a job post is easy. Verifying them before you commit takes a bit more effort — but it's worth every minute compared to finding out about the gaps after launch. A few steps make this process a lot more reliable than just trusting a nice-looking portfolio.
Ask for specific project examples tied to each area above, not vague general statements.
Request access to a live store they've built, and actually test the checkout and load speed yourself.
Give a small technical task relevant to your platform — a real bug, not some generic coding puzzle.
Ask about a time something broke and how they handled it. The answer tells you more than a polished success story ever will.
Running through all of this checklist item by item takes time most people don't have, which is exactly why it can make sense to hire ecommerce developers through a team that already screens for this exact technical depth before anyone gets in front of you.
The technologies behind your store matter just as much as the platform it's built on, and checking for them before you hire saves a lot of pain later. Look past the resume, ask for specifics on frontend, backend, integrations, and security, and actually test what candidates know instead of taking their word for it.
If you'd rather skip the technical screening yourself, EmizenTech puts developers in front of you who are already vetted across Shopify, Magento, WooCommerce, BigCommerce, and the full range of technologies covered above, with flexible engagement options depending on what your project actually needs.
Depends on your platform, but strong backend and API knowledge tends to matter most - integrations and performance issues cause the biggest headaches after launch.
Deep expertise in one platform usually beats scattered, surface-level knowledge across several. Look for genuine strength in whatever platform your store actually runs on.
Ask for a live project you can poke around in, and ask specific questions about how they've handled caching, integrations, or a traffic spike before. Vague, hand-wavy answers are usually a red flag.
Both matter, but for stores dealing with heavy customization, integrations, or scaling issues, backend skill tends to prevent the more expensive problems.
Ask about something that didn't go smoothly and how they fixed it. Real experience shows up in how someone handles failure, not just in a highlight reel of successful launches.
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